package com.obas.monitor.manager;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;


public class SpringContextUtil implements ApplicationContextAware{
   private static ApplicationContext applicationContext;
   
   public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
     SpringContextUtil.applicationContext = applicationContext;
   }
  
   /**
   * @return ApplicationContext
   */
   public static ApplicationContext getApplicationContext() {
     return applicationContext;
   }
  
   /**
   * 获取对象  
   * @param name
   * @return Object 一个以所给名字注册的bean的实例
   * @throws BeansException
   */
   public static Object getBean(String name) throws BeansException {
     return applicationContext.getBean(name);
   }
  
   /**
   * 获取类型为requiredType的对象
   * 如果bean不能被类型转换，相应的异常将会被抛出(BeanNotOfRequiredTypeException)
   * @param name       bean注册名
   * @param requiredType 返回对象类型
   * @return Object 返回requiredType类型对象
   * @throws BeansException
   */
   public static Object getBean(String name, Class requiredType) throws BeansException {
     return applicationContext.getBean(name, requiredType);
   }
  
   /**
   * 如果BeanFactory包含一个与所给名称匹配的bean定义，则返回true
   * @param name
   * @return boolean
   */
   public static boolean containsBean(String name) {
     return applicationContext.containsBean(name);
   }
  
   /**
   * 判断以给定名字注册的bean定义是一个singleton还是一个prototype。
   * 如果与给定名字相应的bean定义没有被找到，将会抛出一个异常(NoSuchBeanDefinitionException)  
   * @param name
   * @return boolean
   * @throws NoSuchBeanDefinitionException
   */
   public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
     return applicationContext.isSingleton(name);
   }
  
   /**
   * @param name
   * @return Class 注册对象的类型
   * @throws NoSuchBeanDefinitionException
   */
   public static Class getType(String name) throws NoSuchBeanDefinitionException {
     return applicationContext.getType(name);
   }
  
   /**
   * 如果给定的bean名字在bean定义中有别名，则返回这些别名  
   * @param name
   * @return
   * @throws NoSuchBeanDefinitionException
   */
   public static String[] getAliases(String name) throws NoSuchBeanDefinitionException {
     return applicationContext.getAliases(name);
   }
}
